A friend of mine got his Ph.D. and become a college professor, so that's one option that he's enjoying so far.
It sounds like the more math-related careers require a higher degree while B.A.s tend to gravitate towards computer science or analyist jobs and such. (If you don't plan on going to grad school, I might suggest a minor to go along with it.)
Some more math-y thins: actuarial science, physics, maybe engineering, finance, some fields of science.
Try Googling for "math degree jobs" or something. Might get you some more results.